public async Task <IActionResult> DeleteQuestion(int chapterId, int questionId)
{
var question = await _context.Set <Question>().FindAsync(questionId);
if (question != null)
{
_context.Remove(question);
await _context.SaveChangesAsync();
}
var questions = await _context.Set <Question>().Where(x => x.ChapterId == chapterId).ToListAsync();
questions.Add(new Question());
return(Ok(questions));
}